聚氨酯-环氧树脂复合乳液的合成与性能

Preparation and Performance of Polyurethane-Epoxy Resin Hybrid Emulsion

以甲苯二异氰酸酯（TDI）、聚醚二元醇（N220）、环氧树脂（E20）为原料合成了聚氨酯-环氧树脂复合乳液（WPUE）。研究了NCO／OH摩尔比、交联剂（TMP）用量、环氧树脂（E20）用量、亲水扩链剂（DM—PA）用量对孔波及涂膜性能的影响。用红外光谱（FT—IR）、热重分析（TG）和差示扫描量热分析（DSC）对膜的结构和热稳定性进行了表征。结果表明，当NCO／OH摩尔比为1．2～1．4，TMP用量为2．5％～3％，E20用量为4％～6％，DMPA用量为7％～9％时，乳液储存期可达12个月，其涂膜具有较好的性能：硬度0．67，拉伸强度11．6MPa，吸水率约为6．8％，主要性能均优于WPU。

The polyurethane-epoxy resin hybrid emulsion was prepared using toluene isocyanate （TDI）, polyether（N220）, and epoxy resin（E20） as main raw materials. Effects of total mole ratio of NCO/OH , the amount of E20, TMP and DMPA on the performance of WPUE were investigated. The structure and thermal stability of WPUE were characterized by FT-IR, TG and DSC respectively. The results show that when the total mole ratio of NCO/OH is 1.2- 1.4, the amount of TMP is 2.5%-3%, the E20 is 4%-6%, the DMPA is 7.5%-9%,the shelf-life stability of WPUE is in excess of 12 months. At the same time the coating film of WPUE has such better performance as： the hardness is 0. 67, tensile strength is 11.6 MPa, water uptake is 6. 8%.